情况如此严峻,我们今后怎么办,出路在哪?许多中外科学家正在为此想办法——迄今为止,在浩茫宇宙中,只有地球才是人类唯一共有的家园。随着科学技术日新月异的发展,人类改造自然的能力越来越大,对自然环境可以随心所欲、轻而易举地加以改变,但有些后果将不堪设想。到本世纪 The situation is so grim. Where are we going from here? Many Chinese and foreign scientists are trying to find solutions to this problem. So far, in the vast universe, only the earth is the only common homeland for mankind. With the rapid development of science and technology, human beings have the ability to transform nature more and more, and can easily change the natural environment freely. However, some consequences will be disastrous. To this century